Support device for chairs



FIG. 1 is a perspective view of the support device for chairs which incorporates our aesthetic design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a left side view thereof. 

The ornamental design for a support device for chairs, as shown and described. 